His teacher worried that the student spent too much time on the computer and not enough time _______.
Mr. Smith has bought a new house in the country, around _____ some green trees.
I'd like to have visited the Palace Museum last week, but something unexpected _____to my father.
—What are you busy with?—The conference _____in our city next week, as you know.
Do you really want to borrow the old room which is empty _____a broken desk and a chair?
Just because they make more money than I do, _____ they seem to look down on me.